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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Methicillin-resistant Staphylococcus aureus or MRSA was discovered in 1961 in the United Kingdom. It if often referred to as a superbug. MRSA infections cause more deaths in the United States every year than AIDS.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.